When the buds of apple trees expand to the leaves, it is the best time for the leaves to supplement calcium, magnesium and trace elements such as boron, iron, manganese, zinc, etc., which can not only meet the needs of branches and shoots, and promote pollen tubes. Elongation can prevent apple yellow leaf disease and small leaf disease at the same time.

Calcium supplementation: After the soil is thawed in spring and before the first root growth peak (March), topdressing calcium nitrate 20-25 kg per mu; also spray 300 times liquid amino acid calcium or other chelate during the bud period of apple tree Calcium solution is sprayed once every 15-20 days for 5-6 times in a row.

Magnesium supplementation: After the soil is thawed in spring and before the first root growth peak, 40-80 kg of calcium-magnesium phosphate fertilizer, or 40-50 kg of silicon-calcium-magnesium compound fertilizer, or 50 kg of fertile fertilizer, or magnesium sulfate 1 ~ 1.5 kg; or spray 1% ~ 2% magnesium sulfate during the budding period of the apple tree.

Boron supplementation applies 150-200 grams of borax or 100-150 grams of boric acid to each tree in the bud and fruit-bearing period of apples. If it is mixed with microbial fertilizer, the effect will be better.

Manganese supplementation During the bud stage of the apple, spray 0.2%～0.3% manganese sulfate solution on the tree body, and then spray once every 20 days for 3 to 4 times; you can also use 0.3% manganese sulfate solution to smear the branches to promote new shoots and leaves. Grow.

To prevent apple yellow leaf disease in the bud stage of apples, spray 3%～5% ferrous sulfate+0.2%～0.3% urea on the tree body. If possible, add a small amount of dishwashing detergent, which can effectively improve the use effect; Ferrous sulfate can be applied to soil, the application rate is 2 to 3 kilograms per mu.

To prevent apple leaf disease during the bud stage of apples, spray 1500-2000 times of organic chelated zinc or 2000-3000 times of amino acid chelated zinc on the tree body, spray once every 7-10 days, and even spray 2-3 times; Topdressing in soil, the amount of organic chelated zinc is 0.2-0.5 kg per mu, and the amount of amino acid chelated zinc is 0.1-0.3 kg per mu.

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